Abstract
Sections of an extruded PS rod have been heat-treated above T g in both dry and aqueous environments. In both cases the sections relax and shrink in the axial direction. Raised surface features reveal the presence of localized orientation due to flow past obstructions in the extruder. The heat treatment in aqueous glycerol followed by quenching results in an internal mist-like pattern which also reflects the flow pattern past the extruder breaker plate. The aqueous diffusion is rapid and apparently Fickian. About 20% of the water present in the mist pattern is in the liquid phase.
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